| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.sqoop.mapreduce; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.sqoop.mapreduce.db.DataDrivenDBInputFormat; |
| |
| /** |
| * InputFormat designed to take data-driven splits and feed them to a mysqldump |
| * invocation running in the mapper. |
| * |
| * The key emitted by this mapper is a WHERE clause to use in the command |
| * to mysqldump. |
| */ |
| public class MySQLDumpInputFormat extends DataDrivenDBInputFormat { |
| |
| public static final Log LOG = LogFactory.getLog( |
| MySQLDumpInputFormat.class.getName()); |
| |
| /** |
| * A RecordReader that just takes the WHERE conditions from the DBInputSplit |
| * and relates them to the mapper as a single input record. |
| */ |
| public static class MySQLDumpRecordReader |
| extends RecordReader<String, NullWritable> { |
| |
| private boolean delivered; |
| private String clause; |
| |
| public MySQLDumpRecordReader(InputSplit split) { |
| initialize(split, null); |
| } |
| |
| @Override |
| public boolean nextKeyValue() { |
| boolean hasNext = !delivered; |
| delivered = true; |
| return hasNext; |
| } |
| |
| @Override |
| public String getCurrentKey() { |
| return clause; |
| } |
| |
| @Override |
| public NullWritable getCurrentValue() { |
| return NullWritable.get(); |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| @Override |
| public float getProgress() { |
| return delivered ? 1.0f : 0.0f; |
| } |
| |
| @Override |
| public void initialize(InputSplit split, TaskAttemptContext context) { |
| DataDrivenDBInputFormat.DataDrivenDBInputSplit dbSplit = |
| (DataDrivenDBInputFormat.DataDrivenDBInputSplit) split; |
| |
| this.clause = "(" + dbSplit.getLowerClause() + ") AND (" |
| + dbSplit.getUpperClause() + ")"; |
| } |
| } |
| |
| public RecordReader<String, NullWritable> createRecordReader(InputSplit split, |
| TaskAttemptContext context) { |
| return new MySQLDumpRecordReader(split); |
| } |
| |
| } |
| |